Screen tensioning mechanism



FIG. 1 is a front perspective view of a screen tensioning mechanism;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a front end view thereof; and,

FIG. 8 is a rear end view thereof. 

The design for a screen tensioning mechanism, as shown and described. 